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Underwater sound channel in the northeastern East China Sea
Song, Heechun,Cho, Chomgun,Hodgkiss, William,Nam, SungHyun,Kim, Sea-Moon,Kim, Byoung-Nam Elsevier 2018 Ocean engineering Vol.147 No.-
<P><B>Abstract</B></P> <P>In May 2015 a shallow-water acoustic variability experiment (SAVEX15) was conducted in the northeastern East China Sea. Surprisingly, an underwater sound channel that is typical for deep water was discovered in this shallow water waveguide (∼100 m deep) with the channel axis at around 40 m. For a broad-band source (0.5–2.0 kHz) deployed close to the channel axis, channel impulse responses observed by a vertical array exhibited a complex arrival structure with a large delay spread (e.g., 160 milliseconds). Most arrivals are found to be surface and bottom reflected, while a pair of high-intensity refracted arrivals are embedded in the early reflected arrivals. Broadband simulations based on a normal mode propagation model show good agreement with data.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An underwater sound channel (USC) typical for deep water is found in the shallow northeastern East China Sea. </LI> <LI> Detailed observations on the environments and underwater acoustic data are presented. </LI> <LI> A complex structure of sound arrivals observed under the USC is separated into refracted and surface/bottom reflected ones with a broad-band simulation. </LI> </UL> </P>
CASE REPORT : Familial Mediterranean Fever With Complete Symptomatic Remission During Pregnancy
( Kwang Taek Kim ),( Hyun Joo Jang ),( Jae Eun Lee ),( Mi Kang Kim ),( Jun Jae Yoo ),( Gye Yeon Lee ),( Sea Hyub Kae ),( Jin Lee ) 대한장연구학회 2015 Intestinal Research Vol.13 No.3
Familial Mediterranean fever (FMF) is an inherited autosomal recessive disorder, ethnically restricted and commonly found among populations surrounding the Mediterranean Sea. FMF is the most prevalent autoinflammatory disease; is characterized by recurrent, self-limited episodes of fever with serositis; and is caused by Mediterranean fever gene (MEFV) mutations on chromosome 16. We describe a case of adult-onset FMF with complete symptomatic remission during pregnancy, without the use of colchicine. A 25-year-old woman had presented with periodic fever, abdominal pain, and vomiting since she was 21. Her abdominal computed tomography scan showed intestinal nonrotation. She underwent exploratory laparotomy and appendectomy for her symptoms 1 year prior. She had a symptom-free pregnancy period, but abdominal pain and fever recurred after delivery. Mutation analysis of the MEFV gene revealed two point mutations (p.Leu110Pro and p.Glu148Gln). We report an adult female patient with FMF in Korea with complete symptomatic remission during pregnancy. (Intest Res 2015;13:287-290)
거제 내만해역에서의 고주파 양상태 해수면 음파산란 채널 측정 및 모의
최강훈,김용빈,김시문,최지웅,Choi, Kang-Hoon,Kim, Yongbin,Kim, Sea-Moon,Choi, Jee Woong 한국음향학회 2021 韓國音響學會誌 Vol.40 No.1
High-frequency bistatic sea surface scattering channels according to sea state were measured at an experimental site of Geoje bay in April 2020, and compared with predictions based on scattering theory. A linear frequency-modulated signal with a center frequency of 128 kHz and a bandwidth of 32 kHz was used for the acoustic measurements. Sea surface wavenumber spectrum was calculated from surface roughness data measured by a wave buoy, and bistatic scattering cross-section of Small Slope Approximation (SSA) based on the wavenumber spectrum was estimated. In addition, scattering from near-surface bubbles using wind speed measured during experiments was considered. Surface scattering channel intensity impulse responses were simulated using the scattering cross-section and the simulation results were compared and analyzed with the field data.
Jeju Island, Shedding its Dark Past and Becoming a Space of Peace
Sea Yoon Lee(Sea Yoon Lee),Yeon Kyeong Kwak(Yeon Kyeong Kwak) 건국대학교 아시아·디아스포라 연구소 2023 International Journal of Diaspora&Cultural Critici Vol.13 No.1
This paper sheds new light on Jeju Island as a unique touristic site where the painful history of exploitation during the Japanese colonial era and the beautiful landscape co-exist. “Dark tourism” refers to visiting a place where a historical tragedy occurred to remember and memorialize past events. Most recently, Jeju Island was announced as an ‘Island of World Peace’ whence a message of peace is to be conveyed to its visitors through tourism. Focusing on Jeju Island offers an opportunity to re-interpret dark tourism. Central to this study have been the questions of reinterpretation of Jeju Island as a ‘space’ reflecting its own characteristics of place. In this article, we aim to explore the possibility of transitioning from a tragic historical place to one emblematic of peace through the retooled message conveyed to visitors, as well as through historical education tourism. We visited the military facilities, GamaOreum, Cave Fort, and the Jeju Peace Museum, as well as Altteureu Airfield, which was built during Japanese occupation, through seven separate field studies from April 2018 to July 2022. Remnants of the Japanese colonial era remain throughout the islands and the history is still relevant to local residents. This study highlights the importance of considering the local community and their residential area in developing a tourist destination. This study presents a new angle of promising applications for future tourism resources in Jeju Island.
추영민,성우제,변성훈,김시문,Chu, Young-Min,Seong, Woo-Jae,Byun, Sung-Hoon,Kim, Sea-Moon 한국음향학회 2009 韓國音響學會誌 Vol.28 No.3
경계면이 존재하는 해양에서의 수중 음파 전달 모델링 시 일반적으로 평평한 경계면을 가정하고 Rayleigh가 제안했던 반사계수를 이용해 반사파를 계산할 수 있다. 하지만 해수면이나 해저면과 같은 실제 해양의 경계면은 불규칙적인 거칠기를 가진다. 이러한 경계면에서의 반사 손실은 실험식이나 산란 이론에 기반한 간섭 반사 계수를 계산하여 구할 수 있다. 본 논문에서는 섭동 이론, Kirchhoff 근사법, 작은 가지 근사법과 같은 산란 이론을 이용하여 유체-유체 경계면에 대한 간섭 반사 계수를 각각 유도한다. 이를 이용하여 임의의 거칠기를 가지는 해수면과 해저면에 대한 각 산란 이론의 간섭 반사계수를 계산하며, 이 결과를 Rayleigh 반사 계수와 비교하여 경계면의 거칠기에 따른 반사 손실을 분석한다. 또한, 섭동 이론과 Kirchhoff 근사법의 결과를 일반적으로 적용 범위가 넓은 작은 기울기 근사법의 결과와 비교하여 각 이론의 유효범위에 대해 고찰한다. When we apply a propagation model to the ocean with boundaries, we can calculate reflected wave using reflection coefficient suggested by Rayleigh assuming the boundaries are flat. But boundaries in ocean such as sea surface and sea bottom have an irregular rough surface. To calculate the reflection loss for an irregular boundary, it is needed to compute the coherent reflection coefficient based on an experimental formula or scattering theory. In this article, we derive the coherent reflection coefficients for a fluid-fluid interface using perturbation theory, Kirchhoff approximation and small-slope approximation respectively. Based on each formula, we can calculate coherent reflection coefficients for a rough sea surface or sea bottom, and then compare them to the Rayleigh reflection coefficient to analyze the reflection loss for a random rough surface. In general, the coherent reflection coefficient based on small-slope approximation has a wide valid region. Comparing it with the coherent reflection coefficients derived from the Kirchhoff approximation and perturbation theory, we discuss a valid region of them.